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Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution.
A. 85.89<µ<92.11
B. 85.88<µ<92.12
C. 87.08<µ<90.92
D. 86.21<µ<91.79
Suppose that in a company with 775 employees, the monthly salaries are normally distributed. The mean salary is $6400 and the standard deviation is $800. About how many employees earn more than $4200 per month?
find the centroid of a thin, flat plate covering the region enclosed by the parabola y^2=x and the line x=2y.
Musical styles other than rock and pop are becoming more popular. A survey of college students finds that 50% like country music, 30% like gospel music, and 15% like both.
Confidence interval for Population mean
Use the Poisson model to approximate the probability. Round your answer to four decimal places.
The Action Sports Network surveyed 265 of its viewers to determine which sports they watched most often. The results of the survey showed:
If a string wound around a fixed circle is unwound while held taut in the plane of the circle, its end P traces an involute of the circle. the circle in question is x^2+y^2=1 and the tracing point starts at (1,0).
A wire lies along the piecewise linear curve extending from the point (2,4) to the point (10,6) to the point (10,9). If the density of the wire is given by p(xy)=2xy+4x , use a line integral to find the mass of the wire. p=rho
The theoretical probability of undesirable side effects resulting from taking Grebex is 1 in 12. If 600 people take Grebex to lower their blood pressure, how many will encounter undesirable side effects?
if three socks are picked at random, what is the probability that at least two are the same color?
Find the volume of a solid that is generated by rotating the region formed by the graphs of y=x^2, y= 2, and x = 0 about the y-axis?
M and N are the midpoints ofSymbol for segment P R.andSymbol for segment Q R.respectively.
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